Email sending with nodemailer + templates

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                  import nodemailer from 'nodemailer';

const transporter = nodemailer.createTransport({
  host: process.env.SMTP_HOST,
  port: Number(process.env.SMTP_PORT ?? 587),
  auth: { user: process.env.SMTP_USER, pass: process.env.SMTP_PASS }
});

export async function sendWelcomeEmail(to: string) {
  return transporter.sendMail({
    to,
    from: 'Codesnips <noreply@codesnips.dev>',
    subject: 'Welcome!',
    text: 'Welcome to Codesnips. Glad you are here.'
  });
}

Email is still a core product channel, and it’s easy to ship broken messages if you don’t treat it like code. I keep templates in source control, render them with a simple templating engine, and send via nodemailer (or a provider SDK). I always include a text alternative and keep links absolute so they work across clients. Logging provider message ids is also clutch—support can trace delivery. I queue emails instead of sending inline in the request path because providers can be slow or rate-limited. The theme here is observability + reliability: retries, dead-letter handling, and boring templates beat cleverness.

Mateo Rodriguez

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Email sending with nodemailer + templates

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